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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 24 |
| 3 | 236 |
| 4 | 2504 |
| 5 | 28332 |
| 6 | 335656 |
| 7 | 4108688 |
| 8 | 51558000 |
| 9 | 659737684 |
| 10 | 8575826448 |
| 11 | 112927383328 |
| 12 | 1503232394344 |
| 13 | 20195196226124 |
| 14 | 273467339844368 |
| 15 | 3728623506924660 |
| 16 | 51145851271818536 |
| 17 | 705322823588365592 |
| 18 | 9772995790887474920 |
| 19 | 135992755093954566300 |
| 20 | 1899633478390401668072 |
[1,4,24,236,2504,28332,335656,4108688,51558000, 659737684,8575826448,112927383328,1503232394344, 20195196226124,273467339844368,3728623506924660, 51145851271818536,705322823588365592, 9772995790887474920,135992755093954566300, 1899633478390401668072] |